Recommended: Birkenstock Blue Footbed Arch Support Insoles
If you're like me, you probably enjoy wearing boat shoes, moccasins, or other shoes that have absolutely no arch support. While I am typically a subscriber to the "sometimes it hurts to look good" school of thought, last fall my knee really started to bother me. I've never really had any other joint issues, but I eventually figured that it was a result of wearing shoes with absolutely no support pretty much every day. Knowing that I needed to do something about it, I went and talked to my buddy Sean who works at Abbadabba's, a local shoe store that caters primarily to hippies, outdoorsy people, and weirdos who insist on wearing vegan shoes.
After trying out several different kinds of insoles, I eventually decided on the Birkenstock Blue insole. It was actually pretty incredible; as soon as I tried them, the pain in my knee immediately went away. Unfortunately they were about $60, but one of the benefits of having a friend who is a manager is at a shoe store is he hooks you up with his discount (thanks, Sean).
I've been wearing them for probably four or five months now and have to say that I am very pleased. They fit in pretty much any shoe that I own (primarily my boat shoes and Bean Blucher mocs), and are fairly comfortable. In fact, if I try going without them for any period of time, it isn't long before my feet and knee start to hurt. My primary quibble with them, aside from the price, is that they do not work so well with sockless wear. They can become dirty and a bit smelly pretty quickly. There are some other companies that make plastic insoles, and I may look into them once the weather gets warmer. However, if you wear boat shoes and/or moccasins on a regular basis, I would highly recommend these. While you can find them online, I would really recommend finding a place near you where you can try them on, though they did seem to fit pretty true-to-size.